Head down the stairs into the large room. Here you'll be confronted by several waves of red enemies, culminating in the appearance of a Red Grappleclaw. Save your Chaos Form for the large monster, but try and take out as many peripheral enemies as you can while you attack it.

With the enemies cleared out the floor will give way, revealing a new tool that will allow you to travel between those odd stained-glass windows found throughout the game.

Look high up on the far east side of the room for a portal. Shoot this with the Voidwalker (click RIGHT STICK to aim) and then shoot a nearby portal that you can jump into. This will allow you to reach the high ledge at the eastern end of the room.

At the northern end of this hallway is another portal on the ground. Shoot the portal on the wall then shoot the portal on the ground with a CHARGED SHOT. This will increase the velocity it spits you out at. If you screw up, you can remove portals by pressing LEFT TRIGGER while charging the Void Walker.

Before entering the wall portal, charge the Voidwalker by holding the RIGHT TRIGGER. With it charged, walk into the wall portal and you'll be shot vertically out of the ground portal. You'll find a Chest (Black Throne 6/34) with 100 Souls here.

Now, float over to the upper area of the hallway. Stand on the pad with the sun on it -- a floor switch -- and look straight up. The nearby window slides up the wall when you stand on this switch. At the top of this shaft is a clump of red crystals which you need to destroy. Shoot this moving window to create a portal on it.

Now, run to the southwest end of the hall. Here you'll find the bomb you need to destroy the red crystals. Shoot the window near the bomb to create another portal. Now, hit the floor switch to raise the first portal panel to the red crystals.

Run to the bomb and pick it up, tossing it through the nearest portal so it warp right up to the red crystals. After it explodes and clears the path, hop in the portal after it to reach the high ledge.

Take the Geysers up to the top area. Here the door will shut behind you. Open one nearby Chest (Black Throne 7/34) for Wrath and the other Chest (Black Throne 8/34) for some health.

Charge a shot with your Voidwalker and shoot the portal on the ground. Shoot the portal on the wall, and then jump into the wall portal. This will send you shooting up to the ledge above.